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DTC Description
 
 
DTC DETECTION LOGIC
DTCM.U.T.-III SE screen terms
(Trouble diagnosis content)
DTC detection condition
U042F00Communication error (invalid)
(Invalid data received from camshaft position control module)
Diagnosis conditionEngine running at idle
Signal (terminal)CAN communication signal
ThresholdECM cannot receive a communication signal sent from the electric intake valve timing control module.
Diagnosis delay time10 ms or more
 
 
POSSIBLE CAUSE
  • Harness or connectors (CAN communication line is open or shorted)
  • Electric intake valve timing control module
 
 
FAIL-SAFE
Engine operating condition in fail-safe mode
Fail safe modeVehicle behavior
Device fix mode
  • This mode fixes the electric IVT motor and the EVT control solenoid valve in the reference position.
  • The intake manifold runner control valve motor is turned OFF (intake manifold runner control valve opens).
  • A control signals is not transmitted to EGR volume control valve and the EGR volume control is deactivated.
Combustion control modeStratified charge combustion control at startingNo stratified charge combustion at starting (cold start).
Idle speed controlStops feedback control of idle speed and controls with specified speed.
Recovery speed control at deceleratingStops recovery speed control by the fuel cut at decelerating and controls with specified speed.
Idle neutral controlStops idle neutral control.
 
 
DTC Confirmation Procedure
1.CHECK DTC PRIORITY
If DTC U042F is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX.
Is applicable DTC detected?
Perform diagnosis of applicable. Refer to DTC Index.
.
 
2.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted. always perform the following procedure before conducting the next test.
  1. Turn ignition switch OFF and wait at least 10 seconds.
  2. Turn ignition switch ON.
  3. Turn ignition switch OFF and wait at least 10 seconds.
: .
 
3.PERFORM DTC CONFIRMATION PROCEDURE
  1. Start the engine and let it idle for at least 1 second.
  2. Check 1st trip DTC.
Is 1st trip DTC detected?
Refer to DTC Diagnosis Procedure.
-1To check malfunction symptom before repair: Refer to Intermittent IncidentIntermittent Incident.
-2Confirmation after repair: INSPECTION END